The formation process of the He I lambda 10830 line in cool giant stars

Details The formation process of the He I lambda 10830 line in cool giant stars The formation process of the He I lambda 10830 line in cool giant stars

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993iowa.rept.....l&link_type=abstract

Final Report, 1 Jul. 1991 - 30 Jun. 1993 Iowa State Univ. of Science and Technology, Ames.

Computer Science

Sound

Cool Stars, Giant Stars, Helium Isotopes, Line Spectra, Proportional Counters, Rosat Mission, X Ray Astronomy, Hertzsprung-Russell Diagram, Hydrodynamics, Radiative Transfer, Sound Waves

Scientific paper

The Final Report on the formation process of the He I lambda 10830 line in cool giant stars is presented. The research involves observing a sample of cool giant stars with ROSAT. These stars were selected from the list of bright stars which display He I lambda 10830 in absorption or emission and lie on the cool side of the coronal dividing line. With measured x ray fluxes or upper limits measured by the Position Sensitive Proportional Counter (PSPC), the role x rays play in the formation of this important line was investigated using the non-LTE radiative transfer code PANDORA. Hydrodynamic calculations were performed to investigate the contributions of acoustic wave heating in the formation of this line as well.

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